First off, the safety rules are because people die without them. They’re there for your protection. The price of them is your boss’ problem, not yours, stop worrying on his behalf, you aren’t getting paid to do his job.

Second: You need to be angry at the boss’ instead of the workers. Why do you think they go on break at the exact time? Because if they spend 10 minutes helping you, that’s 10 minutes they can’t eat their lunch, and if they postpone their break 10 minutes, they’ll be written up or fired for not working. The problem is their boss, you’re angry at the abused instead of the abuser.